Inspectopedia
 
2024.3

Synchronization on an object initialized with a literal

Warning
New
Last modified: 03 December 2024

Reports synchronized blocks that lock on an object initialized with a literal.

String literals are interned and Character, Boolean and Number literals can be allocated from a cache. Because of this, it is possible that some other part of the system, which uses an object initialized with the same literal, is actually holding a reference to the exact same object. This can create unexpected dead-lock situations, if the lock object was thought to be private.

Example:

Use the Warn on all possible literals option to report any synchronization on String, Character, Boolean and Number objects.